Quinton Dial, Mike Purcell and Tank Carradine were the 49ers’ top tacklers. Dial and Carradine were particularly impressive. Dial had a game-high 10 tackles and two forced fumbles.

And Carradine broke through for a sack.

Carradine was a second-round pick last season who did not see any action as he rehabbed from a knee injury that ended his college career. Dial saw very little action as a rookie after a late start because of offseason toe surgery.

“I need to get in a little better shape,” Carradine said. “Now I know the intensity that I need to bring in my approach for the next game.”

Purcell started Thursday’s game at nose tackle after Glenn Dorsey sustained a biceps tear during practice last week. The 49ers have not yet to determined whether Dorsey will miss the season.

The 49ers were thin on the defensive line with Justin Smith (shoulder) and Ray McDonald (biceps) not available due to offseason surgeries. Nose tackle Ian Williams has yet to be cleared to return after sustaining a fractured lower leg in Week 2 of last season.

On Thursday, Demarcus Dobbs (right ankle) and Lawrence Okoye (left ankle) exited Thursday's game with injuries. Okoye said X-rays were negative and he will be fine. There was no word on the extent of Dobbs’ injury. He also underwent X-rays.

Harbaugh said the 49ers would consider adding some depth on the defensive line if it appears Okoye and Dobbs will miss much time.